I was asked pursuant to a recent post if it is permitted to drink during davening.
There are many poskim who permit water or coffee or tea before davening if it will help one concentrate better. It is better to say brachos and korbanos first. If one already made a bracha then if absolutely necessary he may continue drinking after starting psukei d'zimra but should try avoiding it if possible. [Based on a short teshuva of Chacham Ovadiah ztz"l].
This would depend on the huge discussion if a מעשה is considered a hefsek.
ויש להאריך מאד, ואין כאן המקום:-).
